Lennart Poettering
d7e46e01ac
ENODATA is how we usually indicate such "missing info" cases, so we should do this here, too.
102 lines
2.6 KiB
C
102 lines
2.6 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <stdio.h>
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#include "macro.h"
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#include "audit.h"
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#include "util.h"
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#include "process-util.h"
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#include "fileio.h"
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int audit_session_from_pid(pid_t pid, uint32_t *id) {
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_cleanup_free_ char *s = NULL;
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const char *p;
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uint32_t u;
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int r;
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assert(id);
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/* We don't convert ENOENT to ESRCH here, since we can't
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* really distuingish between "audit is not available in the
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* kernel" and "the process does not exist", both which will
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* result in ENOENT. */
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p = procfs_file_alloca(pid, "sessionid");
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r = read_one_line_file(p, &s);
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if (r < 0)
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return r;
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r = safe_atou32(s, &u);
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if (r < 0)
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return r;
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if (u == AUDIT_SESSION_INVALID || u <= 0)
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return -ENODATA;
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*id = u;
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return 0;
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}
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int audit_loginuid_from_pid(pid_t pid, uid_t *uid) {
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_cleanup_free_ char *s = NULL;
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const char *p;
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uid_t u;
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int r;
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assert(uid);
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p = procfs_file_alloca(pid, "loginuid");
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r = read_one_line_file(p, &s);
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if (r < 0)
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return r;
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r = parse_uid(s, &u);
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if (r == -ENXIO) /* the UID was -1 */
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return -ENODATA;
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if (r < 0)
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return r;
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*uid = (uid_t) u;
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return 0;
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}
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bool use_audit(void) {
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static int cached_use = -1;
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if (cached_use < 0) {
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int fd;
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fd = socket(AF_NETLINK, SOCK_RAW|SOCK_CLOEXEC|SOCK_NONBLOCK, NETLINK_AUDIT);
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if (fd < 0)
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cached_use = errno != EAFNOSUPPORT && errno != EPROTONOSUPPORT;
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else {
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cached_use = true;
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safe_close(fd);
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}
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}
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return cached_use;
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}
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